Fig. 4 | Nature Communications

Fig. 4

From: Spiculogenesis and biomineralization in early sponge animals

Fig. 4

Preservation of organic and biosilica structures in Vasispongia delicata. a Demineralized spicule. VPIGM-4717. b EDS point analysis and element maps of a. c BSE-SEM micrograph of partially demineralized spicule. VPIGM-4718. d EDS point analysis and element maps of c, showing organic axial filament enveloped by a silica lamella. Colored dots in a and c denote the location of EDS point analyses shown in b and d, respectively. ic inner core, ot outer lamella, SiO2 siliceous layer

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